[heli-os]

Summary

On the 1st of the month the daily trend draws a single bar across the whole row (screenshot in the #348 discussion). The series runs from the 1st to today, and the view splits the row width across however many days it has. So during the first weeks, bar widths and the axis labels (1, 7, 14, …) move every day.

• Add DailyTrendMetrics.monthColumns(series:today:), a pure function that returns one column per day of the calendar month and marks days after today as future. Only the view pads. monthDailySeries still ends today, as testSeriesStopsAtTodayAndNeverRunsToTheEndOfTheMonth pins, so UsageLedger.merge keeps treating a zero in the series as a real zero.
• Future columns draw no bar, no weekend tick, and take no hover. The regular axis labels (1, 7, 14, 21, 28) stay in a dimmer color, so bars and labels keep their place all month. The rule that drops a regular label next to today now applies on both sides.
• Weekend ticks stop at today. Under empty future columns they read as stray __ __ marks.
• Days from another month stay off the axis. monthDailyTotals is the union of the providers' axes, so just after midnight a provider can still hold last month's series.
• The caption hides "Peak" while only one day has usage. On the 1st it repeated the readout.

Following the discussion in #348: this overlaps that PR's bar row and caption, and we agreed to open it separately. Whichever lands second takes the rebase; I'm happy to do it on my side.

Type of change

• Bug fix
• New feature
• Refactor / cleanup
• Documentation
• Other:

UI changes

Popover Home tab, "Daily this month" row. Rendered from MonthDailyTrend at 2x with the same data on main and on this branch (dark popover background, 360pt width).

	Before	After
Oct 1
Oct 3

Korean UI

	Before	After
10/1
10/3

• On the 1st, the single bar no longer fills the row. It takes the first of 31 columns, and the axis shows 1 (today), 7, 14, 21, 28.
• Bar width and label positions stay fixed all month. Days after today are empty columns with dimmer labels; weekend ticks stop at today.
• "Peak" appears once a second day has usage. On the 1st it repeated the readout.

Checklist

• swift build and swift test pass locally: swift build passes locally. This machine has only Command Line Tools (no XCTest), so the full suite ran in CI instead: 1390 tests, 0 failures, coverage gate passed (run).
• PR title and description are written in English
• UI changes are described above (before/after — images optional)
• No copyrighted assets, secrets, or private tooling references are committed (see CONTRIBUTING)
• Tests were added or updated for this change

Tests in MonthDailyTrendTests:

• New: column count equals the days in the month, including on the 1st, February in a leap year, and months where DST changes. Days after today are future, and missing past days are zero. Days from another month stay off the axis. The peak shows only once two days have usage. Weekend ticks stop at today. The 1st renders the same row height as mid-month.
• Updated: the axis label tests now count labels over the full month's columns, as the view does. The cap of six labels and the no-adjacent-labels rule are checked for every day of the month.

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